Bosch 3922 988 43318 User Manual
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Bosch Security Systems | 04-2003 | 3922 988 43318 en
Digital Congress Network | Installation and Operating Manual | Chapter 10 - Installation Techniques
en | 10-4
Trunk outlets and Tap-offs
Max. number of units connected in series (without the use of extension cables)
The maximum number of units connected in series to a Trunk outlet or Tap-off of a CCU (LBB 3500),
Extension Power Supply unit (LBB 4106/00) and Audio Media Interface unit (LBB 3508/00) is:
Extension Power Supply unit (LBB 4106/00) and Audio Media Interface unit (LBB 3508/00) is:
•
Table-top units
- 50 x Delegate/Chairman discussion units with a PCF value of 1(see Limit 1)
•
Flush mounted units
- 40 x Dual Audio Interface units (see Limit 2),
or 30 x Multi-purpose connection units (see Limit 2),
or 50 x Channel selector units (see Limit 1),
or 24 x Delegate/Chairman Concentus units including interpreter desks with a PCF value of 2.5
or 30 x Multi-purpose connection units (see Limit 2),
or 50 x Channel selector units (see Limit 1),
or 24 x Delegate/Chairman Concentus units including interpreter desks with a PCF value of 2.5
(see limit 2).
Limit 1:
The maximum cable length is 100 m (328 ft.). The length of cable attached to each unit is 2
m (6.5 ft.), therefore a maximum of 50 discussion units (50 x 2 m (6.5 ft.) = 100 m (328 ft.)) can be
connected even though the maximum PCF value of 60 has not yet been reached.
connected even though the maximum PCF value of 60 has not yet been reached.
Limit 2:
The maximum total PCF value that can be connected to one outlet is 60. The Dual Audio
Interface has a PCF value of 1.5 (40 x 1.5 = 60) and the Multi-purpose connection unit has a PCF
value of 2 (2 x 30 = 60).
value of 2 (2 x 30 = 60).
System overload
Each outlet socket is protected against short circuit at the power supply lines, and each has a red LED
indicator
Each outlet socket is protected against short circuit at the power supply lines, and each has a red LED
indicator
to indicate when the trunk-line has exceeded its maximum PCF value. In an
overload situation, when the LED is lit, the system has a built-in delay time of 30 seconds before
scanning the system again for a repeat overload situation. If the overload has been corrected the LED
goes out. Refer to
scanning the system again for a repeat overload situation. If the overload has been corrected the LED
goes out. Refer to
Power Handling Capacity.
FIG 10-3
Overload indication
FIG 10-4
Tap-off limitations
Port 1
Port 2
Rec.
Line
In
Out
In
Out
Symmetrical
Trunk
115 V-T4A 230 V -T2A
Overload LED
also applicable
for LBB 4106/00
also applicable
for LBB 4106/00
Trunk
11 5V-T 4A 2 30V -T2A
Tap-off
In
Port 1
Rec.
Line
In
Out
In
Out
Symmetrical
Trunk
115 V-T4A 230 V -T2A
LBB 3500/xx Central Control Unit
1st Tap-off
LBB 4114/00
LBB 4114/00
LBB 4114/00
LBB 4114/00
1st Tap-off
2nd Tap-off
LBB 4114/00
2nd Tap-off
3rd Tap-off
4th Tap-off
5th Tap-off
4th Tap-off
3rd Tap-off
LBB 4106/00
Tap-off
Trunk-line
Trunk-line
Tap-off